Emerson FM-3 Manuel d'installation télécharger pdf (Page 34)

FM-3 Programming Module Reference Manual

Incremental Indexes

An incremental index will move the motor a specified distance in the + or - direction

regardless of the starting position. The direction of the incremental index motion is

determined by the sign (+ or -) of the Index Distance parameter.

Incremental Index

Figure 25: Incremental Index Example

In the example above, the motor starts at 1 rev, travels a distance of 2 revs and stops at 3 revs.

If the same index is initiated a second time, the FM-3 would move the motor another 2 revs

to a position of 5 revs. If initiated a third time, the motor would travel another 2 revs to a final

position of 7 revs. The example below shows this operation.

Figure 26: Incremental Index Example 2

Registration Index

A Registration Index is used in applications where the motor must move until an object is

detected and then move a specific distance from the point of detection, such as finding a

registration mark and moving a distance beyond.

The Registration Index consists of two parts. The first part accelerates the motor to the target

velocity and continues at this velocity until it receives a registration trigger (sensor or analog).

Upon receipt of a registration trigger, the registration offset will be executed at the target

velocity. The Sensor Limit Distance Hit source can be used to turn on an output, if a sensor

input or analog limit is not received within the Limit Distance. A registration window can

Incremental Index

Start Position = 1 Rev

Index Distance = 2 Revs

Incremental Index

Start Position = 1 Rev

Index Distance = 2 Revs

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Emerson FM-3 Manuel d'installation Page 34